Related Clues:

• Word of assent
• Nifty, in the 50's
• Cry of delight
• 'Uh-huh'
• 'You bet!'
• Slangy approval
• 'I knew it!'
• Wicked
• Def, to a slangster
• It's equal to 100 ergs per gram
• It's positive
• Peachy-keen
• Spiffy
• 'Far out!'
• Marvy